Crimping apparatus



May 28, 1963 c. A. AQUILLON CRIMPING APPARATUS 2 Sheets-Sheet 1 FiledJune 19, 1961 y 1963 c. A. AQUlLLON 3,091,276

CRIMPING APPARATUS Filed June 19, 1961 2 Sheets-Sheet 2 United StatesPatent 3,091,276 CRIBRING APPARATUS Charles A. Aquillon, Newtouville,Mass, assignor to Ark- Les Switch Corporation, Watertown, Mass, 21corporation of Massachusetts Filed June 19, 1961, Ser. No. 118,035 8Claims. (Cl. 153-4.)

This invention relates to a machine or apparatus for crimping sheetmetal electrical terminal lugs in order to fasten them to insulatedwires. More particularly the invention is directed to such a machinewhich is adjustable to crimp the body of a terminal lug properly forelectrical connection to wires of difierent sizes or gauges, which wireshave insulating sheaths thereon of difierent thicknesses or outsidediameters to which the body of; the lug also must be crimped orfastened.

In fastening a terminal lug or similar connector to an insulated wire itis required not only that the lug make proper electrical connection tothe wire but it is vital that the insulation surrounding the wire alsobe held firmly by the lug in order to support the wire so thatmechanical strain is not carried by the conductor alone and so that theinsulation will not split or creep along the wire and expose it beyondthe lug. For this reason improved solderless lug designs provide forportions intended to grip and hold the insulation as well as portionsfor insun'ng good electrical connection of the lug to the wire or cablewithin the insulator. It all wires or cables were of one size or if allinsulation were of one thickness for each wire size, there would belittle problem in designing tools or machines to fasten lugs toinsulated wires. However, wires come in many sizes, and the thickness ofinsulation, even on wire or cable of a single size, varies between wiresintended for di'lterent uses and manufactured to different standards.Therefore, a machine or tool for crimping terminal lugs to insulatedwires has but limited useiulness unless it can be adjusted toaccommodate lugs of different sizes, wires of diiterent sizes andinsulation of different thicknesses.

One object of the present invention is to provide a tool or machine forcrimping lugs or connectors to insulated wires, the machine beingadjustable for a wide range of wire sizes and outside insul tiondiameters, using a variety of lugs.

Another object is to provide such a machine in which the adjustment maybe made easily and quickly for changes in either or both the wire sizeand insulation diameters.

A further object is to provide in such a machine a reinforcingarrangement to prevent damage to the adjusting mechanism while theclinching or crimping operation is being carried out.

Still another object is to provide a means which locks the adjustmentagainst accidental change while the machine is being used.

A still further object is to provide a crimping machine in whichcrimping of lugs of different sizes or types may be accomplished in thesame machine as occasion demands.

In carrying out the objects of this invention in one embodiment thereof,a crimping press is provided with separate movable elements for shapingor forming the wireconnecting portion and the insulation-grippingportion of a terminal lug. The drivers for the forming elements are eachprovided with a separate wedge-like member, each adjustable through agear from an adjusting knob between positions which vary the eiiectivelength of movement of the forming elements. Teeth on the wedge memberswhich mesh with the adjusting gears are used in a novel ratchetingarrangement which holds the wedges in their adjustment and this part ofthe machine is also designed to reinforce the adjusting mechanismsagainst damage during action of the forming elements.

Other objects, advantages and further details of that which is believedto be novel and included in this invention will be clear from thefollowing description and claims, taken with the accompanying drawingsin which is illustrated an example of adjustable crimping machineembodying the present invention and incorporating the improvedadjustable wedge-like members and associated elements.

In the drawings:

FIG. 1 is a front view of the essential parts of a crimping machine orpress according to this invention;

FIG. 2 is a side view of this machine;

FIG. 3 is an enlarged perspective view showing a terminal lug of a typewhich may be crimped or formed in the machine;

FIG. 4 is a similar perspective of the lug of FIG. 3 but with a lengthof insulated wire positioned in it and the lug crimped around the wireand around the insulation;

FIG. 5 is a side view of only the crimping parts of the machine showingthem in the positions they occupy when connecting a terminal lug to awire end;

FIG. 6 is a plan view or the lug holder or anvil in the machine of FIG.5;

FIG. 7 is a sectional view on the line 7-7 of FIG. 2, showing how theanvil is removably held in the table of the machine;

FIG. 8 is an exploded perspective view, showing the adjustment knobs,driving gears, wedge-like adjustment members and associated parts of apress according to the invention;

FIG. 9 is an enlarged vertical sectional view through the machine, onthe line 9-9 of FIG. 1;

FIG. 10 is a sectional view through part of the adjusting mechanism forthe insulation-gripper forming drive on the line lit-10 of FIG. 9;

FIG. 11 is a similar view through another part of the adjustingmechanism on the line 111-1 of FIG. 9;

FIG. 12 is a sectional view like FIG. 10, but on line 12-12 of FIG. 9,showing part of the adjusting mechanism for the wire-connection formingdrive;

FIG. 13 is an enlarged sectional view on line 13-1'3 of FIG. 5, showingdetails of the tip of the insulationgripper forming tool, and

FIG. 14 is a similar section, on line 14 14 of FIG. 5, showing detailsof the tip of the wire-connection forming tool.

In carrying out the objects of this invention in one embodiment thereof,the body or frame 16 of a press carries a movable ram 18 which is guidedin ways 20 in movement toward and away from the base table or bed 22 ofthe press. The bed of the press is fixed relatively to the moving ram,and the drive for the ram may be powered electrically, hydraulically,mechanically, or even manually. However, as will be apparent below,movement of the ram toward the base table is limited. All of theelements above described may be regarded as more or less conventional inproduction machines for forming or crimping terminal lugs to the ends ofinsulated wires.

In the embodiment shown, the end of the ram is provided with a box-likecarrier and adjuster 24 for a pair of lug forming tools 26 and 28. Asuitable cover plate 29 is provided to close the open front of thecarrier 24. The carrier 24 and the tools 26 and 28 are movable with theram toward and away from a replaceable anvil or lug holder 30 which iscarried by the table 22 and serves as a jig or fixture for holding andproperly positioning a terminal lug 32 with respect to the formingtools.

One form of lug which may be crimped by the machine of this invention isshown in FIGS. 3 and 4. It includes the usual tail piece 34 with adetent or dimple -36 therein and has a pair of upstanding wireconnection tabs 38 and a pair of upstanding insulation gripper tabs 40integral therewith. In connecting this lug to a piece'of wire the end ofthe piece is stripped of its insulation 42, thereby exposing the barewire strand or strands 44. The stripped end of the wire is inserted inthe unformed lug shown in FIG. 3 with the end of the insulationstraddled by the insulation gripper tabs 40 and the bare wire straddledby the wire connection tabs 38. Assuming that the lug with the strippedwire therein has previously been placed on the lug holder or anvil inthe press, when the machine is operated the tools 26 and 28 are intendedto form or crimp the tabs 38 and 48 respectively around the bare wire44, to form electrical connection of the lug with the wire, and aroundthe insulation 42 to grip the insulation securely.

For a single size and style of lug to be electrically and mechanicallyconnected to a single size wire which is covered by insulation of auniform known thickness, the lug is placed on an anvil 30 which has beenprovided with a socket or dwell 46 fitting the wire connection tabs ofthe lug and a similar socket or dwell 48 fitting the insulation grippertabs of the lug, leaving the upper ends of the tabsexposed forengagement with the forming tools 26 and 28. If it is desired to workwith a lug of different size or style which cannot be supported properlyby the anvil then being used, the anvil is removed from the table 22 ofthe press, being removably held thereon through its seating in a groove49 in the table and by a spring clip 50 having arms which engagedepressions 52 on either side of the anvil or lug holder. After removalof the unwanted anvil, another anvil is selected of the proper shape andsize for the lug intended to be used. This other anvil is then placed inthe table groove 49 and pressed within the clip 58 until its spring armssnap into the depressions 52, firmly holding the anvil in position.

The forming tool 26 for the wire connection tabs and the forming tool 28for the insulation gripper tabs are designed to crimp the lug tabsproperly over wire sizes and insulation diameters covering a substantialrange, provided that the length of the driving stroke of the ram and oftool carrier 24 is precisely limited with respect to the table 22 andthe anvil 3t} thereon. The present invention is intimately concernedwith the means for varying the effective stroke of the forming tools 26and 28 to suit the press for diiferent wire and insulation sizes. Ofcourse,

. the tools themselves may be removed and replaced with others, but thisshould not be necessary unless a tool becomes worn or damaged or unlessthe size of a wire or of the insulation to be operated upon lies outsidethe range of adjustment of the particular set of tools being used. Eachof the forming tools is mounted in a similar fashion within the toolholder. For example, the wire crimp tool 26 is slidably mounted in theholder 24 and has shoulders 54 which limit its movement out of theholder. The upper horizontal edge 56 of this tool bears against thebottom horizontal edge of a wire crimp pressure plate 58, also slidablymounted within the holder. This is best seen in FIGS. 9'and 12. Theplate 58 is biased toward the tool 26, which in turn is biased towardits outermost position in the holder 24, by a pair of compressionsprings 60, seated in sockets 62 near each end of the plate 58. Theother ends of the springs 60 are seated against a guide bar 64 which isthereby forced within and against a guiding groove 66 in a wedge likeadjustment member 68. The lower faces 70 of this member on either sideof the groovev 66 are slanted from the horizontal, as indicated, andthere are corresponding slanting faces 72 on the top edge :of plate 58.

. The top horizontal face of the adjustment member 68 is provided withcross-wise extending teeth 74. One half oFthe width of the tips of theseteeth bears against one half of the bottom of a ratchet block andbearing member 76 which is solidly fixed within the tool holder as bymachine screws 78. There is a central hole 88 in block 76, for purposeswhich will later be evident. The other half of the bottom of the block76 is similarly engaged by one half of the width of the tips of teeth onan adjustment member for the insulation crimp tool 28, in a sequence ofsimilar parts starting with crimp tool 28, having shoulders 84 and upperedge 86, bearing against pressure plate 8S, compression springs 90 insockets 92, guide bar 94 riding in groove 96 of Wedge like adjustmentmember 88, having slanted lower faces liltbcooperating with slantedupper faces 182 on plate 88. The top of this plate is provided withteeth 104 whose tips bear against'the other half of the bottom of theratchet block 76 as above explained and as seen best in FIG. 9.

Ignoring the adjustments for the moment, and assuming that thewedge-like members 68 and 98 are in the positions shown in FIGS. '12 and10 respectively, when the press is operated the following actions takeplace:

As the ram .18 descends it moves the tool carrier 24 with it, and thetips of tools 26 and 28 will engage the ends of tabs 38 and 40 on a lugseated in the lug holder or anvil. As the ram and tool carrier continueto de-' scend, the tools 26 and 28 will start to slide upwardly withrespect to the moving carrier because their tips are stopped byengagement with the lugs to be cn'mped. This compresses the springs 60and because the bottoms of the plates 5-8 and 88 are engaged against thetop faces 56 and 86 of the tools. Vertical movement of the plates 58 and88 in the carrier is guided and limited by slots 106 and 108respectively in the plates, within which a shouldered guiding screw 110will ride, this screw being suitably threaded into the carrier. The sidewalls of the carrier also guide the plates in their vertical movement,but prevent sidewise movement.

7 Still further movement of the ram and carrier toward the anvil 'willfirst close the space between the slanted faces 78 and 72 and thenimpose further movement of the ram on the tip of tool 26, crimping thetabs 38 around the wire '44 of a cable end in the lug. At about the sametime, the slanted faces and 102 will meet each other and the tool 28will be similarly driven to crimp the tabs '40 around the insulation.This is so, because the wedgelike members 68 and 98 will be pressed uponby the block 7 76 as the ram descends.

Now, as to the adjustment, it is obvious that as the wedge-like membersare moved from the positions shown in FIGS. 10 to 12 to positions towardthe other side of carrier 24, the vertical spaces will beereduced'between the matching'slanted faces 70 and 72 and faces 100 and102. In such changed positions the engagement of the pairs of faces willtake place earlier in the operation of the ram and carrier so that atthe end of the ram stroke.

the tools will have traveled further toward the anvil and couldtherefore crimp a lug on a wire of smaller size than before.

To obtain lateral movement of the members 68 and 98 for this adjustment,an adjustment shaft 112 is rotatably mounted in the carrier 24, passingthrough the hole 80 in block 76, and this shaft carries a wire crimpadjustment gear 114 thereon alongside the block 76. An adjustment knob116 is fixed to the outer end of this shaft so that the position of themember 68 may be controlled and indicated from outside the carrier.

The spur gear 114 meshes with one half the width of teeth 74 on themember 68 so that as the knob 1 16 is rotated the adjustment member willbe driven. It has previously been noted that half the width of the tipsof teeth 74 engage against thebottom of block 76. However, the undersideof the block 76 is not flat but is provided with teeth 118 of the samepitch as teeth 74 but of substantially less depth. These stub-teethareused as made the teeth 74 will ride over the teeth 118, being permitted to do this by compression of springs 60 without becoming entirelydisengaged from the gear 114.

The insulation crimping tool 28 is adjustable through mechanisms similarto those for the wire crimping tool. The adjustment shaft .1 12. carriesa rotatable adjustment collar 120, having a gear segment 122 thereon atone end, alongside the other side of block 76. An adjustment knob .124is keyed or otherwise secured against rotation on the other end of thecollar so that the gear 122 may be rotated and its position indicated bythe knob from outside the tool carrier. Gear 122 meshes with one-halfthe width of the teeth 104 on the wedge-like adjustment member 98, sothat turning of the knob 124 can move the member 8 from one side to theother of the carrier. The ratcheting action of the other half of teeth164 with one half the width of stub-teeth 118 is the same as the actionbetween teeth 74 and 118 on the other side of the block 76. However, theangle of slope of faces and 192 is greater than that of faces 70 and 72.This means that, for the same degree of angular rotation of theadjustment knobs, the adjustment of the insulation crimping tool 'willbe coarser and Will cover a wider range of dimensions than that of thewire crimping tool. Because the full range of adjustment is not needed,the gear 122 is made segmental. However, if a wider range of adjustmentfor the insulation crimper is desired, gear 122 may be complete.

Thus, the block 76 supports both the members 68' and 98 against upwardmovement and consequently protects the adjusting gears .114 and 122,shaft 112 and collar 120 against damage by undue stress when the pressis being operated. At the same time, the sub-teeth 118 serve as aratchet-bar to give definite positions of adjustment to both members 68and 98, holding these members against sidewise displacement when thepress is being operated and against accidental movement at other times.

If lugs of forms different from the ones illustrated are to be cn'mpedin a press according to the invention, it may be necessary to replacethe crimping tools and anvil with forming elements designed specificallyfor the different lug forms.

The tool carrier 24 and ratchet block or bearing member 76 are in effectpart of the ram because all are secured together and move together as aunit. Similarly, the pressure plates 58 and 88 may be regarded as partsof the tools 26 and 23 because they move with their respective tools andcould be made in one piece. They are made separable at the horizontaledges 56 and 86 only for ease in changing the tools without disturbingthe rest of the mechanism.

The spring pressure on the wedge-like members 68' and 93 is important inpermitting the ratcheting action of these adjustable members across thestub-teeth of the block 75 and in holding the teeth 74- and 104 seatedbetween teeth 118 during operation of the press to prevent displacementof the adjustable members. The springs might be mounted otherwise thanas shown, as long as the ratcheting and holding actions areaccomplished.

As will be evident from the foregoing, certain aspects of this inventionare not limited to the particular details set forth as an example, andit is contemplated that various and other modifications and applicationsof the invention will occur to those skilled in the art. Therefore, theappended claims are intended to cover such modifications andapplications as do not depart from the true spirit and scope of theinvention.

What is claimed as new and is desired to be secured by Letters Patent ofthe United States is:

1. In a machine for fastening an electrical connector to both the baredwire and insulation of a piece of insulated wire, said machine having aram movable toward an anvil which holds a connector therein forfastening to a piece of insulated wire which has been bared and said ramcarrying a wire-connection forming tool and an insulation-gripperforming tool which fasten corresponding parts of a connector to a wireheld by the anvil, an improved means for adjusting the position of saidtools carried by said ram, comprising a slanted face on each of saidtools, a pair of wedges with corresponding slanting faces positionednext to said slanted tool faces, a horizontal face with teeth thereon oneach wedge, a spur gear journaled in said ram engageable with portionsof said teeth on one wedge, a second gear engageable with portions ofthe teeth on the other wedge, a horizontal face on said ram carrying arack with stub-teeth thereon engageable with portions of said teeth onboth wedges, and separate knobs for rotating said spur gear and saidsecond gear whereby the positions of said Wedges may be adjusted so thattheir slanted faces are next to different portions of the correspondingslanted tool faces.

2. in connector-crimping apparatus of the type having an anvil, a rammovable toward said anvil, a forming tool carried by said ram andcooperating with said anvil to crimp a connector on a wire placedbetween the tool and anvil when the ram approaches the anvil, thatimprovement in means for varying the distance of approach of said toolto said anvil comprising a spur gear journaled in said ram and havinggear teeth, a wedge movably interposed between said ram and said tool,teeth on said wedge engageable partially with said gear teeth, shallowratchetteeth on said ram engageable partially with said teeth on thewedge, means biasing said wedge teeth toward engagement with said gearteeth and said ratchet-teeth, and a control for rotating said spur gearwhereby said wedge may be adjustably positioned between said ram andsaid tool by rotation of said spur gear and held in adjusted position bysaid ratchet teeth.

3. In a machine for securing a lug to a wire, said machine having ananvil, a ram movable relative thereto, a lug forming tool carried bysaid ram and cooperating with said anvil to secure a lug to a Wireplaced between said tool and anvil when said ram is moved to carry saidtool toward said anvil, an improved means for adjusting the distance ofapproach of said tool to said anvil, comprising a wedge movablyinterposed between said "ram and said tool, a horizontal rack on saidram, having teeth, a horizontal face on said movable wedge, having teethengageable with said rack teeth, a sloping face on said wedge oppositesaid horizontal face, a corresponding sloping face on said tool facingsaid sloping face on the wedge, and means for moving said wedge,ratcheting said wedge teeth over said rack teeth, whereby the positionof the wedge between said rack and said tool is adjusted and itsadjusted position is held by engagement of the wedge teeth with the rackteeth on the ram.

4. In connector-crimping apparatus of the type having an anvil, a rammovable toward said anvil, and a forming tool carried by said ram andcooperating with said anvil to crimp a wire within a connector placedbetween the tool and anvil when the ram approaches the anvil, means forvarying the distance of approach of said tool to said anvil comprising aspur gear journaled in said ram and having gear teeth, a wedge movablyinterposed between said ram and said tool, means guiding said wedge inits movement, teeth on said wedge having parts engageable with said gearteeth, shallow ratchet-teeth on said ram engageable with other parts ofsaid teeth on the wedge, springs biasing said wedge guiding means tourge said wedge teeth toward engagement with said gear teeth and saidratchet-teeth and biasing said tool away from said wedge, and a controlknob for rotating said spur gear, whereby said wedge may be adjustablypositioned between said ram and said tool by rotation of said spur gearby said knob, the springs holding the wedge against the ratchet teeth inadjusted position.

5. In a machine for securing a lug to an insulated wire, said machinehaving an anvil, a ram movable relative thereto, a pair of lug formingtools carried by said ram and cooperating with formations on said anvilto secure a lug to the wire and insulation of an insulated wire placedbetween said tools and anvil formations when said ram is moved to carrysaid tools toward said anvil, and means for adjusting the distance ofapproach of said tools to said anvil, comprising a pair of wedgesmovably interposed each between said ram and of said tools, a horizontalrack on said ram, having teeth thereon, horizontal faces on both saidwedges having teeth engageable with said rack teeth, springs biasingsaid wedges toward engagement with said rack, a sloping face on eachwedge opposite its said horizontal face, a corresponding sloping face oneach tool facing a said sloping face on a wedge, and means for movingsaid wedges independently of one another, ratcheting each said wedgeover said rack teeth, whereby the positions of the wedges between saidrack and said tools are independently adjusted and their adjustedpositions held by spring biased engagement of the wedge teeth with therack teeth on the ram.

6. In a machine for fastening an electrical connector to both the baredwire and insulation of a piece of insulated wire, said machine having aram movable toward an anvil which holds a connector therein forfastening to a piece of insulated wire which has been bared, said ramcarrying a wire-connection forming tool and an insulationgripper formingtool which fasten corresponding parts of a wire to a connector held bythe anvil, means for adjusting the effective positions of said formingtools carried by said ram, comprising a slanted face on each of saidtools, a pair of wedges each with a slanting face positioned next to aslanted tool face and of corresponding slope, a horizontal face withteeth thereon on each wedge, a spur gear journaled in said ramengageable with said teeth on one wedge, a second gear engageable withthe teeth on the other wedge, a horizontal face on said ram carrying arack with stub-teeth thereon engageable with said teeth on both wedges,springs biasing said wedges toward said rack and said gears, andseparate indicating knobs for rotating said spur gear and said secondgear independently, whereby the positions of said wedges may be alteredso that their slanted faces are next to different portions of thecorresponding slanted tool faces and the effective positions of thetools are adjusted.

7. In a machine for crimping an electrical connector 'to both the baredwire and insulation of a piece of insulated wire, said machine having aram movable toward an anvil which holds a connector therein for crimpingto a piece of insulated wire which has been bared and said ram carryinga wire-connection crimping tool and an insulation-gripper crimping toolwhich, in cooperation with said anvil fasten corresponding parts of aconnector to a wire as the ram approaches the anvil, means for adjustingthe efiective crimping positions of said tools carried by said ram,comprising a tool carrier within which the tools are movably mounted onthe ram, a pressure plate above each tool, a slanted face on each ofsaid pressure plates, a pair of movable wedges with correspondingslanting faces positioned opposite said slanted pressure plate faces,guide bars for said wedges, springs extending between said pressureplates and said guide bars, ahorizontal face with teeth thereon oneachwedge, a spur gear journaled in said tool carrier engageable with saidteeth on one wedge, a second gear in said tool carrier engageable withthe teeth on the other wedge, a ratchet block in said tool carriercarrying a rack with stub-teeth thereon engageable with said teeth onboth 'wedges, and separate coaxial knobs on said tool carrier forrotating said spur gear and said second gear whereby the positions ofsaid wedges may be adjusted so that theirslanted faces are oppositedifferent portions of the corresponding slanted pressure plate facesandthe effective crimping positions of said too-ls are altered. t v a gV 8. In 2. lug crimping device having a vertically movable ram memberand a forming tool member carried by said rarn member cooperating withan anvil to crimp a lug on a wire held between the tool and the anvil,means for adjusting the effective positions of, said ram and toolmembers with relation to each other and the anvil comprising a wedgemovable interposed between said ram and tool members, said wedge havinga horizontal face with teeth thereon .and a slanted face, a slanted faceon one of said members corresponding to said slanted face on the wedge,a horizontal rack on the other of said members having teeth engageablewith said teeth on said wedge andta rotatable spur gear having teethalsoengageable with the teeth on said wedge, whereby rotation of saidspur gear will alter the position of said wedge with relation to saidslanted face on said one member while ratcheting the wedge over .therack teeth on said other member.

References Cited in the file of this patent H UNITEDS TATES PATENTS274,216

5,624 V Great Britain V May 7, 1885

1. IN A MACHINE FOR FASTENING AN ELECTRICAL CONNECTOR TO BOTH THE BARED WIRE AND INSULATION OF A PIECE OF INSULATED WIRE, SAID MACHINE HAVING A RAM MOVABLE TOWARD AN ANVIL WHICH HOLDS A CONNECTOR THEREIN FOR FASTENING TO A PIECE OF INSULATED WIRE WHICH HAS BEEN BARED AND SAID RAM CARRYING A WIRE-CONNECTION FORMING TOOL AND AN INSULATION-GRIPPER FORMING TOOL WHICH FASTEN CORRESPONDING PARTS OF A CONNECTOR TO A WIRE HELD BY THE ANVIL, AN IMPROVED MEANS FOR ADJUSTING THE POSITION OF SAID TOOLS CARRIED BY SAID RAM, COMPRISING A SLANTED FACE ON EACH OF SAID TOOLS, A PAIR OF WEDGES WITH CORRESPONDING SLANTING FACES POSITIONED NEXT TO SAID SLANTED TOOL FACES, A HORIZONTAL FACE WITH TEETH THEREON ON EACH WEDGE, A SPUR GEAR JOURNALED IN SAID RAM ENGAGEABLE WITH PORTIONS OF SAID TEETH ON ONE WEDGE, A SECOND GEAR ENGAGEABLE WITH PORTIONS OF THE TEETH ON THE OTHER WEDGE, A HORIZONTAL FACE ON SAID RAM CARRYING A RACK WITH SUB-TEETH THEREON ENGAGEABLE WITH PORTIONS OF SAID TEETH ON BOTH WEDGES, AND SEPARATE KNOBS FOR ROTATING SAID SPUR GEAR AND SAID SECOND GEAR WHEREBY THE POSITIONS OF SAID WEDGES MAY BE ADJUSTED SO THAT THEIR SLANTED FACES ARE NEXT TO DIFFERENT PORTIONS OF THE CORRESPONDING SLANTED TOOL FACES. 